Question

我有以下控制台程序，其中我尝试应用SOLID原则，依赖注入Unity和Prism 6模块化：

主程序：

UnityContainer container = new UnityContainer();

            container.RegisterInstance<IServiceLocator>(new UnityServiceLocator(container));

            container.RegisterType<IModuleInitializer, ModuleInitializer>();

            TextLogger logger = new TextLogger();
            container.RegisterInstance<ILoggerFacade>(logger);

            ConfigurationModuleCatalog catalog = new ConfigurationModuleCatalog();
            container.RegisterInstance<IModuleCatalog>(catalog);

            container.RegisterType<IModuleManager, ModuleManager>();

            IModuleManager manager = container.Resolve<IModuleManager>();
            manager.Run();

App配置文件：

<?xml version="1.0" encoding="utf-8"?>
<configuration>

  <configSections>
    <section name="modules" type="Prism.Modularity.ModulesConfigurationSection, Prism.Wpf" />
  </configSections>

  <modules>

    <module assemblyFile="CalcCommandParsingLib.dll" moduleType="CalcCommandParsingLib.CalculatorCommandParsingModule, CalcCommandParsingLib, Version=1.0.0.0, Culture = neutral, PublicKeyToken=null" moduleName="Parsing" />

    <module assemblyFile="CalculatorLibrary.dll" moduleType="CalculatorLibrary.CalculatorModule, CalculatorLibrary, Version=1.0.0.0, Culture = neutral, PublicKeyToken=null" moduleName="Calculator" />

    <module assemblyFile="InputOutputLibrary.dll" moduleType="InputOutputLibrary.InputOutputModule, InputOutputLibrary, Version=1.0.0.0, Culture = neutral, PublicKeyToken=null" moduleName="InputOutput" />

    <module assemblyFile="MainModuleLibrary.dll" moduleType="MainModuleLibrary.MainModule, MainModuleLibrary, Version=1.0.0.0, Culture = neutral, PublicKeyToken=null" moduleName="Main" >
      <dependencies>
        <dependency moduleName="Calculator" />
        <dependency moduleName="Parsing" />
        <dependency moduleName="InputOutput" />
      </dependencies>
    </module>

  </modules>

</configuration>

导致错误的四个模块之一：

public class MainModule : IModule
    {
        IServiceLocator serviceLocator;

        public MainModule(IServiceLocator serviceLocator)
        {
            this.serviceLocator = serviceLocator;
        }

        public void Initialize()
        {
            ICalculatorReplLoop loop = serviceLocator.GetInstance<ICalculatorReplLoop>();
            loop.Run();
        }
    }

此行发生错误：

ICalculatorReplLoop loop = serviceLocator.GetInstance<ICalculatorReplLoop>();

它是：

类型的例外   发生了'Microsoft.Practices.ServiceLocation.ActivationException'   Microsoft.Practices.ServiceLocation.dll但未在用户中处理   代码

其他信息：尝试获取时发生激活错误   ICalculatorReplLoop类型的实例，键“”

有人可以帮帮我吗？

Answer 1

我认为至少有两件事需要改变：

您还应该注册ICalculatorReplLoop

container.RegisterType<ICalculatorReplLoop, CalculatorReplLoop>();
我更有意义的是直接注入所需的接口，然后通过serviceLocator解决它：

public MainModule(ICalculatorReplLoop calc) { this.calc= calc; }

使用Prism和Unity容器时激活错误

1 个答案: